We're constantly being told wearing a mask protects others, not the wearer themselves, so you'd be quite justified in refusing to work with her. I've been a lifelong believer in 'your body your choice' but that simply doesn't apply when you put others at risk. Plus anyone vulnerable they might come in contact with in the future. The whole pandemic vaccination programme is like a chain, considerably weakened by people like your co worker.
Our Welfare State. Is it broken?
Anyone know a good mosquito repellent?